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LONG-TERM DEBT - Financing Activities (Details) - Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 ("New Hampshire Bonds") due April 2029 - fixed rate interest period through September 2019; bore interest at 4.00% - USD ($) | Oct. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 4.00% | 4.00%
Subsequent event |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount | $ 11,000,000 |  |
Stated interest rate | 2.95% |  |

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